From 28420cd67bc4c0fe5974ac0336528aea3a443b98 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Thu, 19 Oct 2023 14:19:09 +0200
Subject: [PATCH] scripts/ext-toolchain: implement external GCC version
 detection

Some package may needs to enable compatibility option based on the GCC
version.

Currently the GCC version is set based on the default value and doesn't
actually reflect the real value provided by the external toolchain if
used.

Fix this by correctly detecting the GCC version in the external
toolchain and set the correct value in CONFIG_GCC_VERSION.

A new option is added in menuconfig to manually set the GCC version if
needed.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 scripts/ext-toolchain.sh     | 22 ++++++++++++++++++++++
 toolchain/Config.in          |  8 ++++++++
 toolchain/gcc/Config.version |  1 +
 3 files changed, 31 insertions(+)

diff --git a/scripts/ext-toolchain.sh b/scripts/ext-toolchain.sh
index fe1024c18e..1fa2e952bb 100755
--- a/scripts/ext-toolchain.sh
+++ b/scripts/ext-toolchain.sh
@@ -27,6 +27,7 @@ CFLAGS=""
 TOOLCHAIN="."
 
 LIBC_TYPE=""
+GCC_VERSION=""
 
 
 # Library specs
@@ -199,6 +200,19 @@ find_bins() {
 	return 1
 }
 
+find_gcc_version() {
+	if [ -f $TOOLCHAIN/info.mk ]; then
+		GCC_VERSION=$(grep GCC_VERSION $TOOLCHAIN/info.mk | sed 's/GCC_VERSION=//')
+		return 0
+	fi
+
+	echo "Warning! Can't find info.mk, trying to detect with alternative way."
+
+	# Very fragile detection
+	GCC_VERSION=$(find $TOOLCHAIN/bin | grep -oE "gcc-[0-9]+\.[0-9]+\.[0-9]+$" | \
+		head -1 | sed 's/gcc-//')
+}
+
 
 wrap_bin_cc() {
 	local out="$1"
@@ -383,6 +397,13 @@ print_config() {
 		return 1
 	fi
 
+	if [ -n "$GCC_VERSION" ]; then
+		echo "CONFIG_EXTERNAL_GCC_VERSION=\"$GCC_VERSION\"" >> "$config"
+	else
+		echo "Can't detect GCC version. Aborting!" >&2
+		return 1
+	fi
+
 	local lib
 	for lib in C RT PTHREAD GCC STDCPP SSP GFORTRAN GOMP; do
 		local file
@@ -564,6 +585,7 @@ while [ -n "$1" ]; do
 		--config)
 			if probe_cc; then
 				probe_libc
+				find_gcc_version
 				print_config "$1"
 				exit $?
 			fi
diff --git a/toolchain/Config.in b/toolchain/Config.in
index b0273acafd..24caecccb3 100644
--- a/toolchain/Config.in
+++ b/toolchain/Config.in
@@ -150,6 +150,14 @@ menuconfig EXTERNAL_TOOLCHAIN
 
 	endchoice
 
+	config EXTERNAL_GCC_VERSION
+		string
+		prompt "External Toolchain GCC Version" if DEVEL
+		depends on EXTERNAL_TOOLCHAIN && !NATIVE_TOOLCHAIN
+		help
+		  Manually specify the GCC version used by the selected
+		  external toolchain.
+
 	config TOOLCHAIN_LIBC
 		string
 		depends on EXTERNAL_TOOLCHAIN && !NATIVE_TOOLCHAIN
diff --git a/toolchain/gcc/Config.version b/toolchain/gcc/Config.version
index a7e55eb5ca..a00685ffa3 100644
--- a/toolchain/gcc/Config.version
+++ b/toolchain/gcc/Config.version
@@ -8,6 +8,7 @@ config GCC_VERSION_13
 
 config GCC_VERSION
 	string
+	default EXTERNAL_GCC_VERSION	if EXTERNAL_TOOLCHAIN && !NATIVE_TOOLCHAIN
 	default "11.3.0"	if GCC_VERSION_11
 	default "13.2.0"	if GCC_VERSION_13
 	default "12.3.0"